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Text file src/runtime/cgo/gcc_freebsd_arm.c

Documentation: runtime/cgo

     1	// Copyright 2012 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	#include <sys/types.h>
     6	#include <machine/sysarch.h>
     7	#include <sys/signalvar.h>
     8	#include <pthread.h>
     9	#include <signal.h>
    10	#include <string.h>
    11	#include "libcgo.h"
    12	#include "libcgo_unix.h"
    13	
    14	#ifdef ARM_TP_ADDRESS
    15	// ARM_TP_ADDRESS is (ARM_VECTORS_HIGH + 0x1000) or 0xffff1000
    16	// and is known to runtime.read_tls_fallback. Verify it with
    17	// cpp.
    18	#if ARM_TP_ADDRESS != 0xffff1000
    19	#error Wrong ARM_TP_ADDRESS!
    20	#endif
    21	#endif
    22	
    23	static void *threadentry(void*);
    24	
    25	static void (*setg_gcc)(void*);
    26	
    27	void
    28	x_cgo_init(G *g, void (*setg)(void*))
    29	{
    30		pthread_attr_t attr;
    31		size_t size;
    32	
    33		setg_gcc = setg;
    34		pthread_attr_init(&attr);
    35		pthread_attr_getstacksize(&attr, &size);
    36		g->stacklo = (uintptr)&attr - size + 4096;
    37		pthread_attr_destroy(&attr);
    38	}
    39	
    40	
    41	void
    42	_cgo_sys_thread_start(ThreadStart *ts)
    43	{
    44		pthread_attr_t attr;
    45		sigset_t ign, oset;
    46		pthread_t p;
    47		size_t size;
    48		int err;
    49	
    50		SIGFILLSET(ign);
    51		pthread_sigmask(SIG_SETMASK, &ign, &oset);
    52	
    53		// Not sure why the memset is necessary here,
    54		// but without it, we get a bogus stack size
    55		// out of pthread_attr_getstacksize. C'est la Linux.
    56		memset(&attr, 0, sizeof attr);
    57		pthread_attr_init(&attr);
    58		size = 0;
    59		pthread_attr_getstacksize(&attr, &size);
    60		// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    61		ts->g->stackhi = size;
    62		err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    63	
    64		pthread_sigmask(SIG_SETMASK, &oset, nil);
    65	
    66		if (err != 0) {
    67			fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
    68			abort();
    69		}
    70	}
    71	
    72	extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    73	static void*
    74	threadentry(void *v)
    75	{
    76		ThreadStart ts;
    77	
    78		ts = *(ThreadStart*)v;
    79		free(v);
    80	
    81		crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g);
    82		return nil;
    83	}

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